2004ApJ...600L..35M -
Astrophys. J., 600, L35 (2004/January-1)
Inner size of a dust torus in the Seyfert 1 galaxy NGC 4151.
MINEZAKI T., YOSHII Y., KOBAYASHI Y., ENYA K., SUGANUMA M., TOMITA H., AOKI T. and PETERSON B.A.
Abstract (from CDS):
The most intense monitoring observations yet made were carried out on the Seyfert 1 galaxy NGC 4151 in the optical and near-infrared wave bands. A lag from the optical light curve to the near-infrared light curve was measured. The lag time between the V and K light curves at the flux minimum in 2001 was precisely 48+2–3days, as determined by a cross-correlation analysis. The correlation between the optical luminosity of an active galactic nucleus (AGN) and the lag time between the UV/optical and the near-infrared light curves is presented for NGC 4151 in combination with previous lag-time measurements of NGC 4151 and other AGNs in the literature. This correlation is interpreted as thermal dust reverberation in an AGN, where the near-infrared emission from an AGN is expected to be the thermal reradiation from hot dust surrounding the central engine at a radius where the temperature equals that of the dust sublimation temperature. We find that the inner radius of the dust torus in NGC 4151 is ∼0.04 pc corresponding to the measured lag time, well outside the broad-line region determined by other reverberation studies of the emission lines.
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Journal keyword(s):
ISM: Dust, Extinction - Galaxies: Active - Galaxies: Individual: NGC Number: NGC 4151 - Galaxies: Seyfert - Infrared: Galaxies
Simbad objects:
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